The main reason for my current San Francisco Grandma trip was to help our son's family as they begin to vacate their 100 year old house in preparation for a whole house remodel. With all the tech companies in this area.....the city (where all the young folks want to live) is experiencing another gold rush. The lack of housing, combined with big tech salaries has turned properties into precious commodities.
The city's rules and regulations in regard to building of any sort are extreme (and might I add ridiculous). Historic homes, even if they are almost uninhabitable, can not be razed. Instead you'll see houses taken down to the framework, surrounded by scaffolding, and tented to help protect the environment from the debris.
Here are two examples of homes within a block of our son's house. In his case, the architecture and permitting process has taken 3 long years and when actually underway, it will take a minimum of 12 months before it's completed. This endeavor is definitely not for the faint of heart.....and with a 3 year old, another due in a month, a new job for DIL, and a major promotion for our son, I'm truly in awe!